Investigation of Mixing in Multiphase (gas, solid, and liquid) flow through Experimental and Numerical (Computational Fluid Dynamic) Techniques.

通过实验和数值（计算流体动力学）技术研究多相（气体、固体和液体）流中的混合。

• 批准号: RGPIN-2015-06174
• 负责人: Pakzad, Leila
• 金额: $ 1.82万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=661418
• 关键词: Investigation; Mixing; Multiphase; gas; solid

Summary:******Mixing of common non-Newtonian fluids, such as ketchup or mascara, is an important and challenging element of production in many economic sectors, including the chemical, biochemical, food, polymer, pulp & paper, cosmetic, wastewater treatment, and pharmaceutical industries. Unpredictability in process operations, such as mixing, decreases the uniformity of the product, resulting in a decline in product quality, and the need to use excess chemicals for further processing. The annual loss due to poor mixing is estimated at $10 billion in North American chemical industries alone. Multiphase mixing-mixing of solid and liquid, liquid and gas, or solid, liquid and gas-is a common task in most chemical and related industries. In multiphase mixing, agitation is necessary for tasks such as creating homogeneous suspensions, or to increase the contact area between gas bubbles and liquid and promote effective mixing. Designing mixing systems for multiphase applications is thus of great interest to industry. The important parts of mixing equipment are the impellers, which are used in mixing systems to suspend particles and/or disperse gas in non-Newtonian fluids. One recommended mixing system uses a coaxial mixer, which combines a close clearance impeller and an open impeller. However, the fundamental science behind this mixing system design with application in multiphase flow is limited and often relies on trial and error, which is expensive and inefficient. This research program will develop a general methodology to design multiphase flow mixing systems for fluids with complex flow characteristics (rheology). The program will combine advanced flow visualization techniques (e.g. particle image velocimetry, optic probes, and tomography) and advanced computational fluid dynamics (CFD). The proposed experimental and modeling research will improve our understanding of mixing phenomena in multiphase flow with coaxial mixers and answer some of the fundamental questions about system design criteria. For example, it will investigate questions about the selection of mixer type, range of impeller speed, and rotation modes, and how they correspond to mixing effectiveness in agitation of multiphase flow with complex rheology. The outcome of this research program will contribute significantly to the Canadian chemical industry. Improved mixing systems can lead to capital cost savings, reduction in chemical cost and consumption, improved performance of equipment, more reliable process monitoring and control, increased throughput for existing plants, enhanced product quality, and increases in energy efficiency. This research will also contribute to the education and training of HQP in the field of mixing technology, computational fluid dynamics, advanced fluid visualization techniques, rheology, multiphase flow, coaxial mixers, and non-Newtonian fluids. *** **

摘要：****混合常见的非牛顿液（例如番茄酱或睫毛膏）是许多经济领域的重要而挑战的生产要素，包括化学，生化，食品，食物，聚合物，纸浆，化妆品，化妆品，废水，废水处理和制药行业。过程操作（例如混合）的不可预测性会降低产品的均匀性，从而导致产品质量下降，并需要使用过量的化学物质进行进一步加工。仅在北美化学工业中，由于混合不良而造成的年损失估计为100亿美元。固体和液体，液体和气体或固体，液体和气体的多相混合混合 - 在大多数化学和相关行业中都是常见的任务。在多相混合中，搅动对于诸如产生均匀悬浮液或增加气泡和液体之间的接触面积并促进有效混合的任务是必需的。因此，为多相应用设计混合系统引起了行业的极大兴趣。混合设备的重要部分是叶轮，这些部分用于混合系统中，以悬浮颗粒和/或在非牛顿烟中散布气体。一个推荐的混合系统使用同轴搅拌机，该混合器结合了一个近距离的清除叶轮和一个开放的叶轮。但是，这种混合系统设计背后的基本科学与在多相流中的应用是有限的，并且通常依赖于反复试验，这是昂贵且效率低下的。该研究计划将开发一种通用方法，以设计具有复杂流量特征（流动性）的长笛的多个流动混合系统。该程序将结合先进的流动可视化技术（例如粒子图像速度法，光学问题和断层扫描）和高级计算流体动力学（CFD）。提出的实验和建模研究将提高我们对多相流与同轴混合器中混合现象的理解，并回答有关系统设计标准的一些基本问题。例如，它将研究有关混合器类型的选择，叶轮速度范围和旋转模式的问题，以及它们如何与复杂流变学对多流动的搅动时的混合有效性相对应。该研究计划的结果将对加拿大化学工业产生重大贡献。改进的混合系统可以导致节省资本成本，减少化学成本和消费，改善设备的性能，更可靠的过程监控和控制，增加现有工厂的吞吐量，增强的产品质量以及能源效率的提高。这项研究还将有助于HQP在混合技术，计算流体动力学，高级流体可视化技术，流动性，多相流，同轴搅拌器和非牛顿流体的领域的教育和培训。 *****